On Sun, Sep 12, 2021 at 12:05:22AM -0700, Reiji Watanabe wrote: > Hi Raghu and all, > > On Wed, Sep 8, 2021 at 6:38 PM Raghavendra Rao Ananta > <rananta@xxxxxxxxxx> wrote: > > > > At times, such as when in the interrupt handler, the guest wants > > to get the vcpuid that it's running on. As a result, introduce > > get_vcpuid() that returns the vcpuid of the calling vcpu. At its > > backend, the VMM prepares a map of vcpuid and mpidr during VM > > initialization and exports the map to the guest for it to read. > > How about using TPIDR_EL1 to hold the vcpuid ? > i.e. have aarch64_vcpu_setup() set the register to vcpuid and > guest_get_vcpuid() simply return a value of the register. > This would be a simpler solution to implement. That is a great suggestion. It's arch-specific, but maybe the other architectures can mimic it with their own capabilities. And, in the unlikely event a unit test wants that register for itself, then it can build its own mpidr-vcpuid map if necessary. Ship it :-) Thanks, drew
